Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b50c5de968edba…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 21:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41872aef082be1ebf64582de8b7adc20 SHA-1: a76f3f9ef164f7b44ab976af888f41dd9bf7d025 SHA-256: 34b50c5de968edbaa144fe536787126731719015418cf0471e0eec244d90fbe1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are part of a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs suggest a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kanizsakran.hu/userfiles/file/kaxeke.pdf In PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/19563255353.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/60342234206.pdfIn PDF document text
    • http://masonhn.com/d/files/sopanupasugoxedeguw.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gedorilurofefixorivuzuf.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/kedumuneve.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630634013.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/63542754312.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/keluzuratokogimagalupan.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/wopojavilunapunirumesona.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/divemoxapegujiritisode.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/zudibekasuliworuwolopubo.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/59ab9cfdd8eb829f9242a6a97d52c228/75283178041.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/fazalereratesuwaralimakat.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/nizimisiwuxudosobaxepe.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/pivilozukumogi.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/xeranuzaw.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e4b04b2c---nonekovediru.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/kebexi.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/66653045980.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/sepukofulabakus.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210910121832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+lively+wallpaper+for+pcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 10612 bytes
SHA-256: 9b2633e63b4c242bd3d55a30d71bd0b5a7cd31bd079fa89da1c4970c4cb8bc1e
font_02_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 17604 bytes
SHA-256: a0fc8386fd04b4e46403fd0153a3be4c5b02d57fd7cedc7ee77d59d6aca2e721

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